A French team has gone looking for the brain cells that hold our earliest smell memories. But do these memories lay dormant for decades only to burst back to life? Or are we subtly topping them up across the years?

Are you one of the one in six Aussies who reaches for a quick hit of the sticky icky icky before drifting off to sleep? Does it help? What if the calmness it gave switched off your ability to dream? Should that matter? Should you care?

Octopuses fall for the human “rubber hand illusion”, suggesting you don’t need a central brain to feel what’s yours.